@mvhk said in #24:
> I did an experiment here on lichess. On 1 account I played 1000 games with my repertoire and on another account I played again 1000 games with openings which I don't know anything about it. The difference was 100 ratingpoints.
Out of curiosity: what time control were those games? I suspect that the shorter time control, the bigger would be the difference, especially in the initial phase when the "unknown" repertoire is most unfamiliar.